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Proceedings Paper

Convolution-Controlled Rotation And Scale Invariance In Optical Correlation
Author(s): Richard D. Juday; Brian Bourgeois
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Paper Abstract

Wide-band phase-mostly filters are notably "sharp" with respect to in-plane image changes such as rotation and scale differences. Adverse consequences include the necessity of large libraries of reference views covering the range of rotations and scales of the object being recognized. In the near vicinity of an exact match between reference and object, the phase-mostly correlation stands out against background far more strongly than necessary for object recognition. One can move that energy off the peak and into the correlation plane vicinity of the peak with appropriate adjustments to the filter. We present an algorithm that blunts a filter against scale and rotation mismatch: a blurring expressed as a gaussian convolution in the log-polar system. An expression is derived for a four-dimensional cartesian resampling kernel, and an approximate method of implementing it is given. The filter process is shown in computer simulation for frame-grabbed imagery.

Paper Details

Date Published: 22 August 1988
PDF: 8 pages
Proc. SPIE 0938, Digital and Optical Shape Representation and Pattern Recognition, (22 August 1988); doi: 10.1117/12.976593
Show Author Affiliations
Richard D. Juday, NASA Johnson Space Center (United States)
Brian Bourgeois, University of Houston (United States)

Published in SPIE Proceedings Vol. 0938:
Digital and Optical Shape Representation and Pattern Recognition
Richard D. Juday, Editor(s)

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